Do you want to create keyboard layout in iPhone ? It’s easy and don’t need SDK, don’t need programming logic, don’t need to write program for keyboard. However, your iPhone should be jailbreak. Add http://cydia.macforus.com source in Cydia.
How to add source in Cydia
Go to Cydia > Manage > Sources > Edit > Add and then enter http://cydia.macforus.com.
Read More
